Is his penis too big?

Marissa
My boyfriend and I have earth shattering sex...a lot! Pretty much every day that I am not on my period and we are not too tired. But sometimes after we have sex my vagina is super sore! It's not every time, but when it happens it literally feels like my lady bits are raw or torn. And don't get me wrong, my boyfriend is not hurting me purposefully, he would never do that. Could it be because I'm not wet enough? Or his penis is too big (bigger than any other guy I've been with)? Has anyone else experienced this?